Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['v', 'r', 'b', '3789', 'N', '8889', '1581']

22, 18, 2, 3789, 14, 8889, 1581